| Value | Category | Cases | |
|---|---|---|---|
| 1 | Mud | 31471 |
75.8%
|
| 2 | Concrete | 9979 |
24%
|
| 3 | Other | 40 |
0.1%
|
| 4 | Tiles | 10 |
0%
|
| 8 | Unknown | 0 |
0%
|
| 9 | Missing | 0 | |
| Sysmiss | 17759 |